n. A low, sustained, mournful cry, usually indicative of sorrow or pain.n. A similar sound: the eerie moan of the night wind. n. Lamentation.verb-intransitive. To utter a moan or moans.verb-intransitive. To make a sound resembling a moan: A saxophone moaned in the background. verb-intransitive. To complain, lament, or grieve: an old man who still moans about his misspent youth. v. To bewail or bemoan: She moaned her misfortunes to anyone who would listen. v. To utter with moans or a moan.